Telephone receiver



Nov. 17', 1925. 1,562,252

A. PlHL TELEPHONE RECEIVER Filed Aug. 8. 1924 V 2 Sheets-Sheet 1 Nov. 17, 1925.

1,562,252 A. PlHL TELEPHONE RECEIVER Filed Aug. 8. 1924 2 Sheets-Sheet 2 Application filed August To (17! 2.0720122, it may concern:

Be it known that I, ALBERT PHIL, a cltlzen ot' the United States, and resident of Murrav. in the county of Salt Lake and State of Utah, have invented certain new and useful Improvements in Telephone Rece vers, 0t

which the following is a specification.

Mv invention relates-to a telephone re .ii-miwhich is adapted for general use, but especially for wireless'telephony.

lnstrated as being of the watch case typeand is particularly an improvement upon my prior application Serial No. 596,729, filed Oct. 25, 1922. i

An object'of the invention is to provide a novel method of mounting the armature which is directly connected to the, diaphragm, so. that it will be exceedingly sensitive and respond to small current variations.

Another object is to provide a particular form of pole pieces which are em'ployed wlth a permanent magnet of special form thereby producing a very compact construction but one of great utility. 7/

Other objects of the invention w1ll be apparent from the following detailed description and the appended claims.

In the drawings:

Figure 1 is a side elevation of the receiver 3 inelosed in a case and supporting a loud speaker, the case and a portion of the loud speaker being shown in elevation.

Figure 2 is a bottom plan View.

Figure 3 is a top plan View.

Figure 4 is a side elevation. Figure 5 is a side elevation from the posite side. I

.Figure 6 is a side elevation taken from a point half way between the views of Figures 1 at and 5.

Figure 7 is a disassembled view of parts of the receiver. v

Figure 8 is a view similar to Figure 6 but showing a modification.

It is to be noted that the receiver can be .used in any position, so that the terms top and bottom are merely relative, and have been employed on the assumption that the position shown in Figure 1 is normal.

50 The receiver as a whole is carried by a ring member 1 attached to the face of a'larger ring member 2 provided with a central tubular extension 3. The smaller ring member.

just fits within the open end of a cylindrical supporting stand A and the larger ring It is il-' $62,252 UNITEDFSJVTATEIS PATENT OFFICE.

ALBERT PIHL, OF MUIQRAY, UTAH, ASSIGNOR TO HOLLIDAY RADIO & MANUFACTUR- IN G COMPANY, A CORPORATION OF UTAH.

TELEPHONE RECEIVER.

a, 1924. sernn No. 730,939.

inember'rests upon the cylindrical member and may be fastened thereto if desired. The tubular extension 3 is designed to support a loud speaker horn as shown in Figure 1. The stand A is provided with ,an opening C for the introduction of the necessary Wires.

Fastened in suitable manner tothe ring member 1 as by two long screw threaded bolts at and 5 is a permanent magnet 6 which is generally U-shaped in form. Howeverinstead of the free ends of this magnet having their polesupporting faces'in the same pa1'-' allel plane as in my prior application above identified, it is skew-shaped, the end 7 being cutaway on the under face at .8 and the end 9 belng cut away on the upper face at 10, so 1211? the pole supporting faces lie in widely separated planes. The bolts 4 and 5 passthrough holes 11 and 12 respectively in the permanent magnet 6 and attach it to the ring member 1.

The two pole pieces may be made identical in form and one of these is shown in-Figend 9 of the permanent magnet while the other pole piece 17 has its end attached to I the upper face of the end 7 of the permanent magnet and lies between the permanent magnet and the ring 1 and is held in position by the bolt The side flanges of the two pole pieces extend toward each other but do not quite meet.

Two pieces 18 having enlarged ends 19 register with the cut outs 16 and bridge the space between the side flanges 15 of the two pole pieces. These pieces lie between the pole piece. as shown in Figure They also extend thi o'ugh openings 20 in three oval discs 21, and forma core for two coils 22 and 23 of very fine wire. These coils are wound inropposite directions and are connected as shown at 24 in Figures 6 and 7. The openings 20 are connected by elongated slots 25 of about the same width as the pieces 18, v

In the opening thus formed within the coils and discs is mounted an armature 26. This armature is pivoted by means of a spring 27 having its ends fast at 28 in the picces l8 and having a heiid 29 hearing against the armature. The spring not only serves as a pivot, but exerts enough tension to prevent the armature from rattling. The inner end of the armature 26 has a notch 30, which may be a hole instead, and one end of a link or pin 31 is soldered to the armature at this point and at its outer end to the .diaghragm 32. Where the device is used as a loud speaker, the diaphragm iits in a m1lled groove in the edge of the ri ng 1 and 1S held in place by the ring 2. \Vhere the receiver is adapted for head phones, a bronze spring ring may be used to hold the diaphragm in place, said spring ring fitting into the groove in the usual manner.

If desired the bottom of the cup shaped portion of the pole pieces may be made fiat or they may be milled out in a curve corresponding to the curve of the coils as shown at 33. This will tend to give a stronger pull on the armature. The ends of the per manent magnet are arranged in a diagonal direction to prevent the magnetic flux from passing directly through the coil and armature. The pole pieces are also fitted tight to the magnet as shown. By winding the coils in opposite directions, the action of one coil on one end of the armature is in opposite direction to the action of the other coil on the opposite end of the armature, and as -of the wires of the coils are connected.

Vhcn used for head phones, the bridge 34 is omitted and the binding posts suitably mounted on the ring 1 near the bend of the U-shaped' permanent magnet. The omission of the bridge piece, ring 2 and extension 3, enables a very compact construction to be obtained for the head phones.

In the modified form of the structure disclosed in Figure 8, a single large-coil 37 is employed"instead of the two oppositely wound coils. Otherwise the constructions are identical. The double form of coil is also shown in my prior application above identified and there; claimed.

Suitable lock nuts as illustrated are carried by the bolts 4 and 5 and enable the parts to be accurately positioned and held.

with the curve of the coil.

Slight refinements of \structure may be made, and parts of the device used without others, without in any way departing from the spirit of the invention, which is 'to be regarded as limited only by the scope of the 'ap pended claims.

I claim as my invention: 1. A telephone receiver comprising a ring member, a generally U-shaped permanent magnet carried by said ring member and spaced apart in two planes, pole pieces attached to the ends of the permanent magnet and extending inwardly, a coil inclosed by the free ends of the pole pieces, an armature mounted for pivotal movement within the coil, a diaphragm carried by the ring member, and means connecting the dia-' phragm and armature. I

3. A telephone receiver comprising a ring member, a permanent magnet, pole pieces carried thereby and having inclosing sides extending toward each other, a coil inclosed by said sides, an armature within said coil, and means for pivotally supporting said armature which comprises a bent spring -wire attached at its bend to the armature and pivoted atits ends.

4. A telephone receiver comprising a ring member, a permanent magnet, pole pieces carried thereby and having trough shaped free ends with their open sides opposed, a coil supported within the trough shaped ends of the pole pieces, said pole pieces having their'outer sides curved to correspond 5. A telephone receiver comprising a ring member, a permanent magnet, pole pieces carried thereby and having trough shaped free ends milled out so that the bottom of In testimony whereof, I have hereunto 

